RRC Connection Reconfiguration

Dir: ?E-UTRAN -> UE

SRB: SRB1

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這個消息用來修改RRC連接，主要目的：

1.?To establish/modify/release Radio Bearers;

??無線承載

2.?To perform Handover;

??切換

3.?To setup/modify/release Measurements;

??測量控制

4.?To add/modify/release SCells;

??CA SCells

5.?Dedicated NAS information might also be transferred?from eNodeB to UE;

??Piggybacked (Many of NAS Message is piggybacked on RRC Messages)

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RRC 連接重配置與3G的比較, in UMTS存在如下消息：

1.?Transport Channel reconfiguration;

2.?Physical Channel reconfiguration;

3.?Radio Bearer Reconfiguration

4.?Measurement control;

以上者4個消息在LTE中RRC Connection Reconfiguration?全部搞定；

UE 接收到RRC Connection Reconfiguration?消息后的處理：

Refer to 3GPP 36.331

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